I had posted a batch script for you to use, but found something that may be a little kinder (and may work better). Do the following:
Click Start.
Right click My Computer and select Manage.
In the left pane, expand Services and Applications and click Services.
In the right pane, locate Windows Management Instrumentation, right click it, and select Stop.
Next, you need to delete the WMI repository folder:
Open Windows Explorer and navigate to your Windows installation folder. This is the location to which you installed the operating system files; by default it is named Windows, unless you upgraded to XP from Windows 2000, in which case it is named WINNT. This is called the %systemroot% folder.
Navigate to [drive letter]:\%systemroot%\System32\Wbem\Repository and delete all files in the folder.
Reboot the computer.
If this does not work I can offer a couple of other methods.